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Kellys manufactured under API License
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Manufacturing: All
ThyssenKrupp kellys are made from A Straightness
is checked before, during and after each machining operation. Kellys are
rough turned, straightened, bored with specially designed equipment, drifted
straightened, finish turned on specially designed full length kelly turning
lathes, straightened, joints are threaded on CNC equipment and phosphated. Kellys
are welded to API specifications. |
Milling: The next
process is the critical milling operation. All milling is performed on
specially designed rigid kelly mills. Smooth radii
are machined on both ends of each flat to assure the lest possible stress
concentration. The flats are precision milled to a tolerance stricter than
API specifications. The
kellys are straightened one more time prior to serializing, painting and inserting
in ThyssenKrupp standard kelly scabbards for shipping and storage. |
Heat
Treatment: The
forged, heat treated alloy steel used in our kellys has a Brinnel hardness
range of 285-341 and can withstand virtually all drilling conditions. All
ThyssenKrupp kellys are shipped in a protective steel scabbard. Rat hole
scabbards can be supplied on request. Connections
are cold rolled and supplied with pressed steel thread protectors. Other
thread protectors can be supplied on request. |
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